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Whilst climate change is transforming the Arctic into a navigable ocean where small ice floes are floating on the sea surface, the effect of such ice conditions on ship performance has yet to be understood. The present work combines a set of numerical methods to simulate the ship-wave-ice interaction in such ice conditions. Particularly, Computational Fluid Dynamics is applied to provide fluid solutions for the floes and it is incorporated with the Discrete Element Method to govern ice motions and account for ship-ice/ice-ice collisions, by which, the proposed approach innovatively includes ship-generated waves in the interaction. In addition, this work provides two algorithms that can implement computational models with natural ice-floe fields, which takes floe size distribution and randomness into consideration thus achieving high-fidelity modelling of the problem. Following validation against experiments, the model is shown accurate in predicting the ice-floe resistance of a ship, and then a series of simulations are performed to investigate how the resistance is influenced by ship speed, ice concentration, ice thickness and floe diameter. This paper presents a useful approach that can provide power estimates for Arctic shipping and has the potential to facilitate other polar engineering purposes. 相似文献
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简要介绍北极地区航运情况与特点,分别利用芬兰-瑞典冰级规范、芬兰-瑞典冰级规范导则及美国船级社抗冰级船舶指导说明,对一艘阿芙拉型(Aframax)油轮进行1A冰级主机功率加强计算,指出规范计算1A冰级阿芙拉型油轮的不足。讨论虽然针对1A冰级船舶,但对于PC7级船舶的主机功率计算也有指导意义。 相似文献
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Po-Hsing Tseng 《Maritime Policy and Management》2018,45(4):422-438
As Arctic sea ice shrinks due to global warming, the Northern Sea Route (NSR) and the Northwest Passage (NWP) offer a substantial reduction in shipping distance between Asia and the European and North American continents, respectively, when compared to conventional routes through the Suez and Panama Canals. However, Arctic shipping routes have many problems associated with their use. The main objective of this paper is to identify the key criteria that influence the decisions of shipping operators with respect to using Arctic shipping routes. A multi-criteria decision-making methodology, the Fuzzy Analytic Hierarchy Process, is applied to rank four potential categories of criteria (‘economic’, ‘technical’, ‘political’ and ‘safety’ factors) and their sub-criteria.
The results of the analysis suggest that, on aggregate, ‘economic’ is the most important category of influential factors, followed by ‘safety’, ‘technical’ and ‘political’ factors. The paper concludes, however, that the most influential specific sub-criteria relate to risks that lie mainly within the ‘safety’ and ‘political’ domains and that, especially in combination, these overwhelm the importance which is attached to ‘economic’ factors such as reduced fuel use. Finally, the implications of these findings for the future development of Arctic shipping are addressed at a strategic level. 相似文献
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推进全国内河船型标准化研究与探讨 总被引:3,自引:0,他引:3
本文介绍了我国内河航运发展情况,船型标准化的发展历史和现状,阐述了推进内河船型标准化的指导思想、原则及目标,分析了船型标准化与技术进步的关系,并提出相关政策建议。 相似文献
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北极航道通航的重要意义及对我国的影响 总被引:2,自引:0,他引:2
随着北极气候逐渐变暖,北极冰盖加速融化,北极航道全面通航的可能性日益增加。北极航道将成为中欧、中美货物运输新通道,挑战传统远洋运输航线,改变国际航运格局,对我国未来航运事业发展将产生重大影响。本文从北极航道通航带来的全球性影响以及对我国经济、航运格局、能源格局以及地缘环境影响等角度,通过分析北极航道的历史与现状、全面通航所带来的优势与劣势,提出我国应对北极航道通航的对策与建议。 相似文献
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随着《NSM规则》的全面实施,,一些游离在《NSM规则》管理之外的船舶,呈现出掉队、淘汰的趋势或成为安全管理的难点。本文结合在海事行政执法过程中的工作体会,从坚持科学发展观出发,通过对非公司化管理船舶的形成原因、发展趋势和安全现状的分析,提出实施科学有效监管的措施,以期达到推进船公司规范、健康和好中加快发展的目的。 相似文献
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珠江水系内河航运现状及船型标准化调研报告 总被引:1,自引:0,他引:1
本文是推进珠江水系内河船型标准化工作调研报告的部分内容。报告分析了珠江水系推进船型标准化存在的问题,通过征求有关部门和地方航运业者意见,提出了珠江水系推进船型标准化的建议。 相似文献
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文中拟就在上海洋山深水港建立船舶定线制的必要性、可行性,以及定线制方案进行初步探讨,通过在洋山深水港实施船舶定线制为上海国际航运中心建设提供安全畅通有序的通航环境。 相似文献
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以低速肥大型船舶的系列模型试验为依托,分析了船模和实船各阻力分量在不同傅氏9数下随船型参数变化的变化趋势,给出阻力分量随船型变化的平均曲线,结合另外10型肥大型船舶及3个系列,初步给出了低速肥大型船舶船模和实船各阻力分量占总阻力百分比随傅氏数变化的曲线。 相似文献
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在分析了有关船舶在浅水水域试航速修正方法的基础上,推荐了A.Millward的三因次修正方法用于大型船舶在有限水深水域试航速的修正,文中给出的算例,表明在航速预报结果同相关方法相比,具有同一量级的精度,本方法可作为大型船舶试航航速修正或预报有一种估算方法。 相似文献
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介绍了由作者设计的双体水翼船和船模试验研究情况。试验中,对船模的一些主要要素进行了变化,得出了它们对船模和影响的一些规律。 相似文献
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传统Lindqvist半经验公式存在将不同船型阻力的计算结果均一化的缺点,文章基于船首不同区域的海冰破坏模式,采用船体纵向切片法对传统Lindqvist半经验公式进行了改进。通过将传统及改进后的半经验公式计算结果与模型试验结果进行比较,验证了改进的Lindqvist半经验公式计算结果的有效性和正确性。进而通过半经验公式计算方法,研究船速和船舶吃水对船体所受破冰阻力的影响。结果表明,改进的Lindqvist半经验公式计算结果明显高于传统Lindqvist半经验公式,与试验值更为接近;船舶破冰阻力随船速呈近似线性增长的趋势,随船舶吃水的增加呈现减小的趋势。 相似文献
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Recently, the melting of Arctic sea ice and development of maritime technology are enabling the regular voyages in Arctic waters. However, the Arctic maritime transportation system (AMTS) is a complex and dynamic system with respect to human, technical, environmental and organizational issues. For example, ships operating in Arctic waters suffer severe weather conditions, fully and partially ice-covered waters, and are also difficult to search and rescue in ice-covered Arctic waters due to remoteness from lands. These risk factors will influence the safety and security of ships operating in Arctic waters. For this, this paper identifies potential risk influencing factors (RIFs) for the AMTS from human, technical (ship), environmental and organizational aspects. An analytical hierarchy process (AHP) method is used to analyze the hierarchical relationships and calculate the relative importance of the selected RIFs. Due to the complexity and uncertainty involved in the comprehensive analysis of RIFs for the AMTS, fuzzy sets are incorporated into AHP analysis to represent and treat the epistemic uncertainty. The identified critical RIFs in this study can be used to propose specific guidance for the operations of crews on board, ship owners, and ship managers. 相似文献
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双体船的静水阻力估算 总被引:1,自引:0,他引:1
根据Fr<0.38的9条具有对称片体的双体船的阻力试验资料,探讨了船型对剩余阻力系数CR的影响,应用归纳方法得到CR的峰、谷值及时应的傅汝德数的表达式.所有估算表达式均以参数:相对片体间距k/b、宽度吃水比b/T、棱形系数CP和排水体积长度系数CV的函数形式表示.按本文提出的双体船阻力估算方法所得结果与模型试验的吻合比较满意. 相似文献